Up until Monday, I wanted to freeze T at this age - inquisitive, able to focus on things that interest her for 10 minutes, learning new things a lot, with tantrums that were easy to get her out of (usually caused by hunger so some Cheerios were a miracle cure). Then Tuesday - coincidentally, when DH left for a few days for a business trip - things went downhill. Tantrums not out of frustration over not being understood, but because she didn't get what she wanted. Shrieking "MINE" and "NO" like a pterodactyl when I dared to dress her or change her diaper or cut off dinner time at 6 in an attempt to avoid middle of the night reflux. It's amazing how quickly she changed from easy to deal with to a tantrum-y mess.